time overflow check; ref #2337

mrbgems/mruby-time/src/time.c

@@ -201,6 +201,13 @@ time_alloc(mrb_state *mrb, double sec, double usec, enum mrb_timezone timezone)
 
   tm = (struct mrb_time *)mrb_malloc(mrb, sizeof(struct mrb_time));
   tm->sec  = (time_t)sec;
+  if (sizeof(time_t) == 4 && (sec > (double)INT32_MAX || (double)INT32_MIN > sec)) {
+    goto out_of_range;
+  }
+  else if ((sec > 0 && tm->sec < 0) || (sec < 0 && (double)tm->sec > sec)) {
+  out_of_range:
+    mrb_raisef(mrb, E_ARGUMENT_ERROR, "%S out of Time range", mrb_float_value(mrb, sec));
+  }
   tm->usec = (time_t)((sec - tm->sec) * 1.0e6 + usec);
   while (tm->usec < 0) {
     tm->sec--;